Receiver Processor For Adaptive Windowing And High-Resolution TOA Determination In A Multiple Receiver Target Location System

摘要

The present invention provides methods for a high-resolution active RTLS tag location determination system that provides for <1 ns TOA accuracy and resolution and significantly reduces the channel effects of multipath interference, even in low SNR applications. To accomplish these objectives, the present invention provides for an iterative and adaptive windowing function in each of the receivers of a receiver grid that captures multiple reflections of multiple transmissions from each of the associated target RTLS tags. The adaptive windowing function is used in conjunction with an asynchronous transmit and receive clock function that effectively increases resolution of TOA detection to levels less than the minimum detection window width associated with each of the receivers in the receiver grid.

主权项

1. A method for determining target location in a multiple receiver target location system, comprising:
determining a coarse estimate of a time-of-arrival (TOA) of blink data from at least two of a plurality of receivers based on a detection of a pulse in an adjustable coarse timing window; determining a fine estimate of the TOA from the at least two of the plurality of receivers based on a detection of the pulse in at least one of a set of fine timing windows; and determining, using the processor, a sub-window resolution of the TOA from the at least two of the plurality of receivers based on at least one detection transition between consecutive fine receiver windows of at least one of a plurality of pulses.